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The Role of Ice Splintering on Microphysics of Deep Convective Clouds Forming Under Different Aerosol Conditions : Simulations Using the Model With Spectral Bin Microphysics

Qu, Yi ; Khain, Alexander ; Phillips, Vaughan LU ; Ilotoviz, Eyal ; Shpund, Jacob ; Patade, Sachin LU and Chen, Baojun (2020) In Journal of Geophysical Research: Atmospheres 125(3).
Abstract

Observations during the Ice in Clouds Experiment-Tropical (ICE-T) field experiment show that the ice particles concentration in a developing deep convective clouds at the level of T = −15 °C reached about 500 L−1, that is, many orders higher than that of ice-nucleating particle. To simulate microphysics of these clouds, the 2-D Hebrew University Cloud model (HUCM) with spectral bin microphysics was used in which two main types of ice multiplication mechanisms were included in addition to the Hallet-Mossop mechanism. In the first ice multiplication mechanism ice splinters form by drop freezing and drop-ice collisions. Ice multiplication of this type dominates during developing stage of cloud evolution, when liquid water... (More)

Observations during the Ice in Clouds Experiment-Tropical (ICE-T) field experiment show that the ice particles concentration in a developing deep convective clouds at the level of T = −15 °C reached about 500 L−1, that is, many orders higher than that of ice-nucleating particle. To simulate microphysics of these clouds, the 2-D Hebrew University Cloud model (HUCM) with spectral bin microphysics was used in which two main types of ice multiplication mechanisms were included in addition to the Hallet-Mossop mechanism. In the first ice multiplication mechanism ice splinters form by drop freezing and drop-ice collisions. Ice multiplication of this type dominates during developing stage of cloud evolution, when liquid water content is significant. At later stage when clouds become nearly glaciated, ice crystals are produced largely by ice splintering during ice-ice collisions (the second ice multiplication mechanism). Simulations show that droplet size distributions, as well as size distributions of ice particles, agree well with the measurements during ICE-T. Simulations with different cloud condensation nuclei concentrations show the existence of the “optimum” cloud condensation nuclei concentration (or droplet concentration), at which concentration of ice splinters reaches maximum. In these simulations ice nucleation caused by the direct formation of ice crystals upon ice-nucleating particles, as well as the Hallett-Mossop process, has a negligible contribution to the ice crystal concentration.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
mixed-phase clouds ice multiplication aerosol effects
in
Journal of Geophysical Research: Atmospheres
volume
125
issue
3
article number
e2019JD031312
publisher
Wiley-Blackwell Publishing Ltd
external identifiers
  • scopus:85079444743
ISSN
2169-897X
DOI
10.1029/2019JD031312
language
English
LU publication?
yes
id
097b1e86-a4c3-4c76-b29f-7e5669dd4bb2
date added to LUP
2020-02-26 16:06:07
date last changed
2020-03-03 05:52:51
@article{097b1e86-a4c3-4c76-b29f-7e5669dd4bb2,
  abstract     = {<p>Observations during the Ice in Clouds Experiment-Tropical (ICE-T) field experiment show that the ice particles concentration in a developing deep convective clouds at the level of T = −15 °C reached about 500 L<sup>−1</sup>, that is, many orders higher than that of ice-nucleating particle. To simulate microphysics of these clouds, the 2-D Hebrew University Cloud model (HUCM) with spectral bin microphysics was used in which two main types of ice multiplication mechanisms were included in addition to the Hallet-Mossop mechanism. In the first ice multiplication mechanism ice splinters form by drop freezing and drop-ice collisions. Ice multiplication of this type dominates during developing stage of cloud evolution, when liquid water content is significant. At later stage when clouds become nearly glaciated, ice crystals are produced largely by ice splintering during ice-ice collisions (the second ice multiplication mechanism). Simulations show that droplet size distributions, as well as size distributions of ice particles, agree well with the measurements during ICE-T. Simulations with different cloud condensation nuclei concentrations show the existence of the “optimum” cloud condensation nuclei concentration (or droplet concentration), at which concentration of ice splinters reaches maximum. In these simulations ice nucleation caused by the direct formation of ice crystals upon ice-nucleating particles, as well as the Hallett-Mossop process, has a negligible contribution to the ice crystal concentration.</p>},
  author       = {Qu, Yi and Khain, Alexander and Phillips, Vaughan and Ilotoviz, Eyal and Shpund, Jacob and Patade, Sachin and Chen, Baojun},
  issn         = {2169-897X},
  language     = {eng},
  month        = {02},
  number       = {3},
  publisher    = {Wiley-Blackwell Publishing Ltd},
  series       = {Journal of Geophysical Research: Atmospheres},
  title        = {The Role of Ice Splintering on Microphysics of Deep Convective Clouds Forming Under Different Aerosol Conditions : Simulations Using the Model With Spectral Bin Microphysics},
  url          = {http://dx.doi.org/10.1029/2019JD031312},
  doi          = {10.1029/2019JD031312},
  volume       = {125},
  year         = {2020},
}